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8 Cards in this Set
- Front
- Back
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The spinal accessory nucleus is only found at which level of the brainstem? lateral to the medial lemnisci; dorsal to the pyramidal tracts (which are the ventral-most structures in this part of the stem)
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Spinal Accessory (CN XI) nucleus, motor
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the open medulla sports a trio of cranial nerve nuclei near the floor of the 4th ventricle- name the nuclei and describe their spatial relationships to one another
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from medial to lateral (and ventral to dorsal, because the 4th ventricle is triangular shaped):
1. CN XII (motor) 2. Dorsal motor Vagus (CN X and parasympathetic efferents) 3. solitary tract (autonomics VII, IX, X) |
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nucleus ambiguous (what does it house, which level, what makes it unique with respect to spatial relationships at that level)
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nucleus ambiguous
1. CN X motor: larynx/pharynx muscles 2. open medulla 3. only open medulla cranial nerve nucleus that is not lining the 4th ventricle |
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in the transition from the ______ to the _______, the thin strips of the medial lemnisci change from a ______ orientation to a _______ orientation.
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in the transition from the _open medulla_ to the _pons_, the thin strips of the medial lemnisci change from a _vertical_ orientation to a _horizontal_ orientation.
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Distinguising feature of the PONs
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Pontine nuclei - input from cerebral cortex into the contralateral cerebellar hemisphere (via middle cerebellar peduncle); pontine nuclei are lateral to the corticospinal tract dark spots (which are near the midline); more ventral than dorsal
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cranial nerve nuclei in the pons:
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CN VII
CN V motor CN V sensory all three are near the ventricle; from most lateral to least: sensory V, motor V, motor VII |
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one would find a trio of CN nuclei in the open medulla near the ventricle; at the level of the pons, the only nuclei found in this region are the ________ nuclei
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one would find a trio of CN nuclei in the open medulla near the ventricle; at the level of the pons, the only nuclei found in this region are the _vestibular_ nuclei
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describe the dorsal elements of the midbrain
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-inferior/superior colliculi (auditory/visual, respectively), dorsal-most structure)
-periaqueductal gray matter surrounding cerebral aqueduct -trochlear and occulomotor nuclei (CN IV and III) -medial lemnisci: completely lateral, somewhat near D/V divide |
